There are pros and cons on both sides but for me, I think gambling is riskier than investing that's because in gambling you can just lose a lot of BTC in an instant with just one click but in investing you can choose right one so you don't get scammed or lose all of your BTC in an instant. I do believe that investing is much better than gambling because in investing you can really see that you will earn in the long term. There are still risks in investing and its not 100% that you will really earn but the chances are higher than gambling. In gambling it really depends on luck and I don't think that you'll always have the luck to win in every gambling game that you play. I think it is just a matter of the person preference on either he/she wants to gamble or invest but for me i'll always choose investing than gambling.